The construction or installation of a rainwater tank below ground is development specified for this code if:(a) it is constructed or installed on land in Zone RU1, RU2, RU3, RU4 or R5, and(b) it is not constructed or installed on land that is identified on an Acid Sulfate Map as being Class 1–5.
State Environmental Planning Policy (Exempt and Complying Development Codes) 2008